This is a discussion on Water softener,,, any suggestion? within the Detailing Forum forums, part of the Tech & Modifying & General Repairs category; I am renting my house so i am not going to install a whole house water softener. Do you guys ...

This thing uses a "filter" to treat the water and attaches to the garden hose. You have to replace the filter every 10 washes or so depending on how bad your water is, but it definitely helps keep water spots away.

This thing uses a "filter" to treat the water and attaches to the garden hose. You have to replace the filter every 10 washes or so depending on how bad your water is, but it definitely helps keep water spots away.

Water softeners won't prevent spots, they simply exchange magnesium, calcium, and occasionally iron ions for sodium and potassium. However the spots from soften water would likely be less severe.

For 100% spot free washing, the CR System is definitely the way to go. The best price on one will be at Costco and you can buy the replacement resin by the cubic foot pretty reasonably here. How long the resin last will depend on the hardness of your water and what you use it for. If you just use it on the final rinse it should last a while. The city water at my house is around 180ppm, which is on the low side so mine last quite a while. There is a chart on the Costco site that shows the average amount of gallons you should expect based on your water hardness. You also want to rinse using a nozzle that restricts the water flow...the unit at Costco comes with one.

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